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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Strain-Based Design Model for FRP-Confined Concrete Columns
Author(s): N. Saenz and C.P. Pantelides
Publication: Special Publication
Appears on pages(s): 1011-1028
Keywords: confinement; constitutive model; stress-strain relationships
Abstract:A constitutive strain-based confinement model is developed herein forcircular concrete columns confined with fiber reinforced polymer (FRP) composites. Aseries of relationships were developed from experimental data, which facilitated theestablishment of the strain-based model. The FRP-confined concrete constitutivemodel calculates the internal damage of the column by using the radial strain. Theradial and axial strains at zero volumetric strain were used to mark the beginning ofeffective dilation response of the FRP composite jacket. The secant concrete moduluswas used in the model and expressed as a function of the secant modulus softeningrate, which depends on the ultimate radial to axial strain ratio. The experimentalrelationship for the ultimate radial to axial strain ratio is a function of the normalizedeffective confining stiffness. The secant modulus softening rate is constant throughoutthe plastic stress-strain response until failure. The FRP-confined concrete constitutivemodel evaluates the ultimate radial strain, which was related to the FRP compositeeffectiveness. The FRP-confined concrete model predicts the stress-strain responseaccurately for any normalized effective confinement stiffness.
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